The Brown Filter Bag – Group size, is a lightweight, compact, and durable canvas water filter that is easy to use and carry. It can be used on its own as a highly effective sediment water filter and this larger, group size version, holds up to 20 litres.
The Brown bag is also effective when used in conjunction with a combined filter/purification system as a pre filter to prevent clogging and extending the filtering life of the system.
The Brown filter bag available in two sizes, personal and group, each is virtually unbreakable and has an unlimited filtering capacity.
The Brown filter bag is a product that Rupert Brown of Browns Bushcraft started to develop back in 2011. After difficulty trying to source the original Millbank bags, Rupert traced the original manufacturer of the military canvas and has had the exact same specification made, but without the potentially harmful copper anti rotting compound found in the early military bags. These are now made in the UK.
Endorsed by SAS survival legend John “Lofty” Wiseman.
Using your Brown bag for the first time:
How to break in your new Brown bag:
- Prior to using your brand new Brown bag on your next trip, expedition or adventure it is essential that the new bag is broken in before. The fibres and weave of the canvas need to be loosened up and opened in order to maximise its performance
How to use the Brown bag:
- Saturate the bags in water, squeeze the water through the bags to ensure they are fully wetted.
- Then be rough with them! Scrunch them up, massage and squeeze the bags. This will help to soften the canvas and open up the fibres.
- Repeat the process 3/4 times allowing the bag to dry in-between.
- You can also put the bags in the washing machine. Place in a clean washing machine on a cold rinse cycle with NO detergent and NO fabric softener. Always remove the paracord before placing in washing machine.
After use and care:
- Once you have found a source of water to be filtered, make sure you have a suitable point to hang the bag from when its full of water. You can for example use a tree, tripod or vehicle.
- Start by thoroughly soaking the bag in water, massage the water through the bag to insure it is saturated.
- Fill the bag to the top with water to be filtered. It sometimes helps to use a cup to scoop water in to fill the bag to the top.
- Allow the water in the bag to flow down to the stitched line that’s runs across the front of the bag approx. ¼ of the way down the bag. Do not collect this water, allow it to run onto the ground. This helps remove any debris on the outside of the bag and prevent it from dropping into your collecting pot.
- Once the water has flowed down to the line you can place a vessel under the bag to collect the filtered water. If the water is very dirty you can always pass it through the bag a second time. A group size bag will take a number of hours to filter. When using a group size bag a good technique is to allow it to filter overnight, you will then have a stock of filtered water ready to disinfect the following morning.
- Once the water has been filtered it must be purified. Although it may look clean it may contain pathogens which need to be removed by purification. The water can be purified by being brought to a rolling boil, adding chemicals or using a purification system.
- After each use turn the bag inside out and remove any built up sediment and debris. You can wash it out in clean water or allow the bag to dry out, this enables you to knock the dried sediment out once dried. Make sure the bag is thoroughly dried before storing away for your next adventure!